Who was the first to measure the circumference of earth ........

General Studies (CHSL) Geography

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Who was the first to measure the circumference of earth?

Erechtheus

Aegeus

Eratosthenes

Apheidas

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Explanation:

Measuring the angle of a shadow cast by the sun at noon in Alexandria, Eratosthenes found it to be 1/50th of a circle. Eratosthenes then calculated the distance between Syene and Alexandria, and correlated that distance to the circumference of his hypothetical circle.

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